Synthesis method of anti-degradation cationic polyacrylamide

Abstract

The invention belongs to the technical field of polyacrylamide, and particularly relates to a synthesis method of anti-degradation cationic polyacrylamide, which comprises the following steps: adding an inorganic salt auxiliary agent, acrylamide and acryloyloxyethyl trimethyl ammonium chloride into deionized water according to the mass percent of dry substances, dissolving and mixing to obtain a material solution with a certain mass concentration; and pumping the solution into a polymerization kettle, introducing nitrogen for 40 minutes; then adding a composite initiator, continuing introducing nitrogen for 3 minutes, thickening the feed liquid; then carrying out pressure building polymerization for 3 hours, and carrying out granulation, drying, grinding and other processes on the colloid to obtain a particle product, namely the anti-degradation cationic polyacrylamide. A composite initiation system and free radical aqueous solution polymerization are adopted, so that the viscosity and charge binding force of the product are improved, and the degradation resistance of the product is improved; the product yield is improved, the yield and the quality are improved, the production cost and the use cost are reduced, and the cost performance is higher.

Description

technical field [0001] The invention belongs to the technical field of polyacrylamide, and in particular relates to a synthesis method of anti-degradation cationic polyacrylamide. Background technique [0002] The acyloxy group (ester group) in the macromolecular structure of cationic polyacrylamide (PAM) itself has a tendency to be easily hydrolyzed into carboxyl and hydroxyl groups. The calcium and magnesium ion solution in tap water is slightly alkaline, which promotes the progress of hydrolysis. The final carboxylate group is an anion, and forms flocculation with cationic groups to make the solution whitish and reduce the viscosity. [0003] The general reason for the degradation of cationic polyacrylamide is that the dissolution time after dilution and preparation is too long. Cationic polyacrylamide is generally dissolved and used immediately, and the dissolved solution begins to degrade after being placed for 8 hours. There are three main factors that affect the degr...

AI Technical Summary

Problems solved by technology

There are three main factors that affect the degradation of cationic polyacrylamide solution: 1. It is caused by long-term contact between the solution and iron metal, because the ions produced by iron in contact with oxygen and water will directly affect the amide group in polyacrylamide, resulting in the dissolution of the dissolved molecules. 2. After the solution is exposed to the sun, the ultraviolet rays in the sun will also cause the product to degrade, and the molecular chain will be broken and hydrolyzed. Generally, the storage requirement of solid PAM is to store it in a well-ventilated warehouse and avoid Humidity and sunlight exposure, after preparing the PAM solution, if it is not used up, it should be sealed to avoid natural degradation caused by direct sunlight; 3. The influence of aqueous solution and ambient temperature on the solution, the temperature is higher than 40 ℃, which will easily promote the breakage of the molecular chain of the product, resulting in The viscosity of the product is reduced, which affects the flocculation effect

[0004] The combination of the above three factors further aggravates the degradation of cationic polyacrylamide, which will seriously affect the application flocculation effect of the product, or even fail completely.